Haiku's 64bit port is progressing nicely. "As you can see, this looks pretty much like a regular Haiku desktop. There's still a lot of things missing, though - not many apps or drivers yet. However, most things should be fairly simple to get working, typically just a few compilation fixes."

The multi-user concept is not the only way to provide security. An operating system is not inherently insecure because it does not provide multi-user support.

Here is an hypothetical operating system: It does not have a multi-user implementation. However, privileged operations can only be performed by passing security mechanisms like fingerprint or retina scans. Does that make it more insecure than a multi-user operating system?